I love how all of the cast portrayed their roles, except for the partner of Baek dong soo, (Yoo Ji-Sun) who seemed to never acted at all. her acting pisses me off. but overall the acting of the rest of the characters are great..
I watched this because of Yoo sheung Ho, and though he wasn't the lead Role, he actually nailed it.. I liked his character more than Dong soo.. But in this series you'll get to love the second lead, than the actual lead.
Overall, Great series. I hope to see more of YSH and JCW together..

For me the story revolved on Sky Lord and Sword Saint. who later on become Dong Soo and Eu Woon.
This story is soo heart breaking. Specially in the end part. I don't know what's gotten into the writer's minds but there are other ways to end this story that killing Eun Woo which disgusted almost all of the viewers.

More power! This series is so unforgettable for me.